How do I get staking rewards from a node via API?

[taiki94]

This may not be the right place to ask this question, but I didn't know where to ask it.

I am building an XDC node following the Git instructions here.
I think the basic API specifications are the same as Ethereum, but I have no information on how to get the staking rewards, so I would like to know how to get them.

For example, the following blockchain explorer appears to have several staking rewards for "81408".
I would like to retrieve these staking rewards through the node's API.

https://observer.xdc.org/epochs/81408#voters

Best regards